windows 11 I have a password protected excel file (Office Professional 2016) on my Dell XPS (Windows 11) that has worked perfectly for the last couple of years.

[Guest Weatsea]

Since the last Windows 11 update to version 24H2 and a crash which autosaved open spreadsheets, I could not open the password protected file. I tried creating another file and protected that file and similarly it did not open, just whirred around or came up with a message "the last time you tried to open filename.xlsx, it caused a serious error". Then I could not open Excel at all. After stopping and re-starting Excel I did manage to somehow open it once. There is no "unprotect button" showing, but I did manage to take off the protection by clearing the password and saving it as unprotecte

 

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